/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.processors.query.calcite.exec.rel;

import org.apache.ignite.internal.util.typedef.F;
import org.jetbrains.annotations.NotNull;

/**
 * A node with a single input
 */
public interface SingleNode<Row> extends Node<Row> {
    /** */
    default void register(@NotNull Node<Row> src) {
        register(F.asList(src));
    }

    /** */
    default @NotNull Node<Row> source() {
        return F.first(sources());
    }
}
